Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 9, Pages 3350-3356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am2004762
Keywords
superhydrophobic; surface modification; flexible substrate; wettability control; thermal stability; impact dynamics
Funding
- Samsung Electronics
- POSCO
- National Research Foundation [NRF2010-0009545, NRF2010-0015975]
- Korean Research Foundation
- Korean Government (MOEHRD) [KRF-2008-005-J00501]
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Herein, a facile approach for the fabrication of a superhydrophobic nanocoating through a simple spin-coating and chemical modification is demonstrated. The resulting coated surface displayed a static water contact angle of 158 degrees and contact angle hysteresis of 1, showing excellent superhydrophobicity. The surface wettability could be modulated by the number of ZnO nanoparticle coating cycles, which in turn affected surface roughness. Because of its surface-independent characteristics, this method could be applicable to a wide range of substrates including metals, semiconductors, papers, cotton fabrics, and even flexible polymer substrates. This superhydrophobic surface showed high stability in thermal and dynamic conditions, which are essential elements for practical applications. Furthermore, the reversible switching of wetting behaviors from the superhydrophilic state to the superhydrophobic state was demonstrated using repeated chemical modification/heat treatment cycles of the coating films.
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